Modeling And Simulation Of Vehicle Electric Power Steering System Based On ADAMS

Electric power steering system is the inevitable developing direction for automobile power steering, which is much superior to hydraulic power steering system. Based on the theory of Multi-Body System Dynamics, multi-body system dynamics models of full vehicle are built in the Mechanical System Simulation software, ADAMS/CAR, and dynamic simulation of full model were performed in order to study the evaluation and control strategy of EPS.The whole article include five chapters:In chapter one, Development status quo, principle, structure, key parts, classification of EPS are introduced. By contrast EPS to HPS and EHPS, the author points out that EPS have some merits of which HPS and EHPS can't possess .In this chapter ,the author also introduces the development of model of vehicle system dynamics and control strategy.In chapter two, introduced the research method-the theory of multi-body system dynamic, the thorough introduction to the modules and theory of ADAMS, one of the most popular multi-body system dynamics software packages. A EPS of rack type and a whole of 16 degree dynamic model are built up.In chapter three , analyzes the effect of electric power steering on the steering performance and study the object evaluation of steering performance of electric steering. The new system of evaluation includes steering maneuverability, srevomotion sensitivity and assist characteristic.In chapter four, the assist characteristic of EPS is studied. The influence of straight-line type assist characteristic ,PD type control assist characteristic and fuzzy-PD type assist characteristic are simulation respectively.In chapter five, the contents and conclusion are summed up. Also some advice on the improvement of later research is given.